任何事物的发生发展,都必须具备一定条件。耕作制度是影响害虫发生的十分敏感的条件。回顾我县耕作制度的变更史与害虫的发展史,就可以看出,耕作制度即使发生微小的变化,都会引起某些害虫的大波动。正确预计害虫发生趋势,是制定害虫防治计划的重要依据。也是正确指挥防治的成败关键。研究耕作制与害虫发生的关系,就是为正确预测害虫发生,提供依据。下面就我县耕作制度的演变史以及以此为主导因素,引起害虫种类、发生量变化的发展史。加以论述。解放前夕及解放初期,我县以老三熟(主要搭配形式是肥用紫云英—早中稻—秋黄豆或 Anything happening and developing must have certain conditions. Farming systems are very sensitive conditions that affect the occurrence of pests. Recalling the history of the change of farming system in our county and the history of the development of pests, we can see that even slight changes in the farming system can cause some major fluctuations in pests. Correctly predicting pest occurrence trends is an important basis for formulating pest control programs. It is also the key to the success or failure of correctly directing prevention and control. To study the relationship between tillage system and pest occurrence is to provide a basis for the correct prediction of pest occurrence. The following evolution of the history of farming system in our county and as a leading factor, causing pest species, the occurrence of changes in the history of the development. To be discussed. On the eve of the liberation and the liberation of the early, my county to the third generation of cooked (mainly with the form of fertilizer with Astragalus - early middle of the year - autumn beans or